Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73a7e2ee928c220…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 07:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba25b7ee13f26fadb6947cf645a2c5f9 SHA-1: db3c2531413209a05a365ff28f7e1eb71988471b SHA-256: a73a7e2ee928c2203798dad780a4384d6ff8af60e403192bfc66c9d8d459a2fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=what+does+it+mean+when+you+don%2527t+have+a+conscience PDF link annotation
    • http://sparzha.club/18954986342nd00k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fe98d5c94ca3.pdfIn PDF document text
    • http://rimka.xyz/banjercito_nogales_sonora_numero_deqqalr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fecf7a0251ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_6019f5d7b41a7.pdfIn PDF document text
    • http://barbanapoli.moscow/developing_tactics_for_listening_audio_script4t936.pdfIn PDF document text
    • http://nesobaka7.xyz/kesixuguwobovasdbt6x.pdfIn PDF document text
    • http://stnold.com/informacje_o_obrazie_babie_latoecl87.pdfIn PDF document text
    • http://yourbigdick.space/autodesk_step_file_viewercv43v.pdfIn PDF document text
    • http://doordash.fun/tratamiento_para_alopecia_areata7c2rd.pdfIn PDF document text
    • http://meetly.space/wubakenezuvilinumexumey31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_6016f17ed5346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8064d5ab-def4-4b0c-89c1-4a30c6d15ecd/mr._coffee_cafe_barista_espresso_and_cappuccino_maker_with_milk_steamer.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/milolumamakisofu.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/fojoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/25861705955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64fd8a8-fd53-45b3-91ed-86e0fe5f7991/twas_the_night_before_christmas_poem_original_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2bf99d-ec79-422e-945e-26cd580298db/kepuwufofagaruvaxotiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa47d3d3-3823-43ad-bf71-ea07bb442e0c/how_to_write_compare_and_contrast_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef71abaa-415e-48dd-b126-faa0e2888aa1/brk_smoke_and_carbon_monoxide_alarm_sc9120a_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/analgesia_en_obstetricia_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 5352 bytes
SHA-256: d90480197187727fa2cd216a733f95cc4a483c1dbc5171765b8fb22ef4b523ff
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10352 bytes
SHA-256: f53f37b2956190d6aeb4dcc72f8f4b29fac4c1250761d520309cb1f4429fea20

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